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snottyotter-
Thanks for the suggestions (and @edscoble).
Too much preload?
(Sorry for the probably obvious question) you mean preload on the cranks? I'll give this a try for sure.
You haven't whacked spacers on it when you shouldn't have?
I don't think so, actually I didn't fit the BB as I didn't have the tool at the time so took it to my LBS.
tjmw
What can I do about a Shimano BB (BBR60 - Italian threaded) in which the crank is not spinning freely? Even without the chain on it feels like it takes too much effort to turn the cranks. Weird thing is, even though I built this bike up a couple of years ago when the BB was brand new, it's hardly done any distance. I'd guess in the few hundreds of km. It doesn't feel grindy or gritty or anything, still quite smooth if that makes sense, but just hard to turn the cranks. Does it likely just need servicing/new grease? (Shamefully I've got no experience of servicing a BB, maybe that's about to change!)